本文讨论了污水中微量氰化物用银滴定法的定量测定。含氰离子溶液,调节PH到11;用试银灵(DABR)和百里酚酞络合剂(TPC)为混合指示剂,以0.001M硝酸银滴定,溶液颜色变化由黄绿色到红紫色,终点敏锐,0.2PPm的CN~-能被测定(经吹气蒸馏可测定含CN~-为0.05PPm的水样),误差在±6％以下。 This article discusses the quantitative determination of trace cyanide in sewage by silver titration. The solution containing cyanide ions was adjusted to pH 11; titration was performed with 0.001 M silver nitrate using DABR and TPC as the mixed indicator. The color of the solution changed from yellow-green to magenta, and the endpoint Sensitive, 0.2PPm CN ~ - can be measured (by blowing gas distillation can be measured with CN ~ - 0.05PPm of water samples), the error of ± 6% or less.